You create your own mind
Once you understand that you can literally force your brain to exist in a certain way, you start to realize that much of the world you see before you is simply the result of how you wish to see it. If you spend most of your time playing video games instead of doing your job, guess which one you’re going to be better at? We might not be able to control every little thing that happens to us, but we can control how it affects us and how we build neural pathways around it.
So, try it for yourself. Try forming positive thought patterns by focusing on the good things about your life and who you are, rather than all of the bad. Use your understanding of your mind to better yourself.